6 separate questions. I have figured out the other 20 questions I am stuck. Please help Thanks

The correct name for the ionic compound Al2Se3 is?

The correct name for the ionic compound
Fe2Se3 is?

the Roman numerall III in the name Iron(III)oxice indicates what?

Which of the following compounds contains four atoms per formula unit? please Explain and show
a. chrominum(III)nitride
b. tin(II)iodide
c. magnesium floride
d. ruthenium(III)chloride

The formulas of the sulfate ion, the nitrate ion, and the phosphate ion are, respectively:

which of the following compounds has a formula that contains parentheses?
a. barium carbonate
b. lithium hydroxide
c. strontium hydroxide
d. ammonium hydroxide

The correct name for the ionic compound Al2Se3 is?

I would name this aluminum selenide but some might prefer the name aluminum triselenide.

The correct name for the ionic compound
Fe2Se3 is?
I would name this iron(III) selenide; some may prefer iron(III) triselenide.

the Roman numerall III in the name Iron(III)oxice indicates what?
The (III) indicates that the iron has an oxidation state of III (as opposed to II or some other number).


Which of the following compounds contains four atoms per formula unit? please Explain and show
a. chrominum(III)nitride
b. tin(II)iodide
c. magnesium floride
d. ruthenium(III)chloride
The formulas are
a. CrN = 2 atoms/formula unit.
b. SnI2 = 3 atoms/formula unit
c. MgF2 = 3 atoms/formula unit
d. RhCl3 = 4 atoms/formula unit


The formulas of the sulfate ion, the nitrate ion, and the phosphate ion are, respectively:

sulfate is SO4^2-
nitrate is NO3^-
phosphate is PO4^3-


which of the following compounds has a formula that contains parentheses?
a. barium carbonate
b. lithium hydroxide
c. strontium hydroxide
d. ammonium hydroxide
The formulas are
BaCO3
Li(OH)2
Sr(OH)2
NH4OH

Iron(III) selenide

It indicates the ion Fe is a Plus 3 valence
chromiumIIInitride CrN3
-2, -1, -3 You really ought to be memorizing these.

Sr(OH)2

Sure, I can help you with these questions.

1. The correct name for the ionic compound Al2Se3 is aluminum selenide. To determine the name, you need to identify the elements' symbols (Al for aluminum and Se for selenium) and their charges (Al has a charge of +3, and Se has a charge of -2). The charges are then balanced to form a neutral compound, resulting in a ratio of 2 Al atoms to 3 Se atoms, hence the name aluminum selenide.

2. The correct name for the ionic compound Fe2Se3 is iron(III) selenide. Similar to the previous question, you need to identify the symbols (Fe for iron and Se for selenium) and their charges (Fe has a charge of +3, and Se has a charge of -2). Balancing the charges results in a ratio of 2 Fe atoms to 3 Se atoms, and since the charge on iron is +3, it is indicated in the name as iron(III) selenide.

3. The Roman numeral III in the name Iron(III) oxide indicates the oxidation state of the iron ion in the compound. The Roman numeral III represents a charge of +3 for the iron ion. In compounds, the oxidation state of an element is indicated by the Roman numerals in parentheses if it can have multiple possible charges, which helps specify the composition of the compound.

4. To determine which of the compounds contains four atoms per formula unit, we need to consider the ratios of the different elements in each compound.

a. Chromium(III) nitride (CrN) contains one chromium atom and one nitrogen atom per formula unit, totaling two atoms.
b. Tin(II) iodide (SnI2) contains one tin atom and two iodine atoms per formula unit, totaling three atoms.
c. Magnesium fluoride (MgF2) contains one magnesium atom and two fluoride atoms per formula unit, totaling three atoms.
d. Ruthenium(III) chloride (RuCl3) contains one ruthenium atom and three chlorine atoms per formula unit, totaling four atoms.

Therefore, the correct answer is d. Ruthenium(III) chloride, as it contains four atoms per formula unit.

5. The formulas of the sulfate ion, nitrate ion, and phosphate ion are SO4^2-, NO3^-, and PO4^3-, respectively. These formulas represent polyatomic ions, which are groups of atoms that carry a net charge and act as a single unit in chemical compounds.

6. The compound that has a formula containing parentheses is ammonium hydroxide (NH4OH). The formula contains parentheses to group the ammonium ion (NH4^+) together, indicating that it acts as a single unit with a charge of +1. The hydroxide ion (OH^-) carries a charge of -1 and is not enclosed in parentheses since it does not form a specific group within the compound.

Therefore, the correct answer is d. Ammonium hydroxide.